While any C&C server takedown is a win, the impact may be minimal, as the two primary servers are fully active, and the datacenters hosting them are unresponsive to fully documented abuse reports.

That being said, FireEye's Atif Mushtaq noted that the botnet does has some weak spots, including the fact that Grum has no failback mechanism, has just a few IPs hardcoded into the binaries, and the botnet is divided into small segments, so even if some C&Cs are not taken down, part of botnet can still remain offline.